Well sentiment analysis for news seems to have gained mainstream acceptance, with major providers like Reuters offering apps in that space. For twitter, etc. i

Well sentiment analysis for news seems to have gained mainstream acceptance, with major providers like Reuters offering apps in that space. For twitter, etc. it's still a relatively new field. There's a paper on it at http://arxiv.org/abs/1010.3003 http://arxiv.org/abs/1010.3003